Anno 1800 Lan Multiplayer Fixed 2021 Review

Windows classifies networks as either "Public" or "Private." By default, Windows blocks local discovery on Public networks to protect your device. For LAN multiplayer to function, all participants must set their network profile to Private.

This error is often a result of version mismatch or launcher issues, or a deeper connectivity bug. Make sure all players have the latest game updates and that Ubisoft Connect is fully patched. If the error persists, it is a known bug that has affected some players for years, sometimes without a clear workaround.

Use a "Clean Boot" to ensure other apps aren't hogging the bandwidth required for real-time synchronization. 🧩 Mod Mismatch Checklist

Anno 1800 requires an internet connection and Ubisoft Connect login even for local multiplayer. There is no direct TCP/IP or classic LAN tab. anno 1800 lan multiplayer fixed

: Ensure all players have "Set time automatically" enabled in Windows settings and click Sync now to prevent session desyncs.

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Anno 1800 utilizes a strict multiplayer protocol that requires all connected clients to be perfectly synchronized. If your system clock drifts by even a few seconds, the game will trigger a desync error (LR40) and boot players from the match. Windows classifies networks as either "Public" or "Private

Because multiple computers in the same household share a single public IP address, your router’s Network Address Translation (NAT) table can become confused when routing incoming game data to different machines. Windows Defender Firewall Setup

All players install the same VPN tool and join the same virtual network.

: Regularly delete the cache folder located inside your Ubisoft Connect installation directory ( C:\Program Files (x86)\Ubisoft\Ubisoft Game Launch\cache ). Make sure all players have the latest game

This performs a series of network resets found in various community fixes.

TCP: 80, 443, 13000, 13005, 13200, 14000, 14001, 14020, 14021, 14022, 14023, 14024 Anno 1800 Game Ports: UDP: 18000

By systematically applying these firewall rules, network priorities, and in-game performance caps, your Anno 1800 local network sessions will remain perfectly synced, ensuring uninterrupted industrial expansion across your sessions. Share public link